From: Gary Padgett To: Michael V. Padua Subject: April Tracks Date: Wednesday, July 15, 1998 5:52 PM GLOBAL TROPICAL CYCLONE TRACKS - APRIL 1998 SOUTH INDIAN OCEAN (SIO) - South Indian Ocean West of Longitude 90E NOTE: The tracking and intensity information for South Indian Ocean Basin tropical cyclones is based upon operational warnings from the Joint Typhoon Warning Center of the U.S. Air Force and Navy on the island of Guam. The MSW are based on a 1-min averaging period, which is used by all U.S. civilian and military weather services for tropical cyclone warnings. ************************************************************************* Storm Name: GEMMA Cyclone Number: 32-S Basin: SIO Date Time Lat Lon Cen Pres MSW Remarks (GMT) (mb) (kts) ------------------------------------------------------------------------- 98 APR 07 0000 14.1 S 71.4 E 30 98 APR 07 1200 13.8 S 72.0 E 30 98 APR 08 0000 13.8 S 72.2 E 45 98 APR 08 1200 14.5 S 71.4 E 50 98 APR 09 0000 13.8 S 70.0 E 55 98 APR 09 0600 14.9 S 71.4 E 55 98 APR 09 1200 15.0 S 71.8 E 60 98 APR 10 0000 15.6 S 72.4 E 60 98 APR 10 1200 16.3 S 74.1 E 65 98 APR 11 0000 16.3 S 75.7 E 70 98 APR 11 0600 15.7 S 75.9 E 65 98 APR 11 1200 15.4 S 76.6 E 65 98 APR 12 0000 15.1 S 77.0 E 65 98 APR 12 1200 14.7 S 78.0 E 55 98 APR 13 0000 14.9 S 78.1 E 45 98 APR 13 1200 14.6 S 77.7 E 45 98 APR 14 0000 14.6 S 77.9 E 35 98 APR 14 1200 14.2 S 76.5 E 35 98 APR 15 0000 14.2 S 75.4 E 30 ************************************************************************* Storm Name: 33S Cyclone Number: 33-S Basin: SIO Date Time Lat Lon Cen Pres MSW Remarks (GMT) (mb) (kts) ------------------------------------------------------------------------- 98 APR 07 0000 16.8 S 75.8 E 30 98 APR 07 1200 15.4 S 73.7 E 30 NOTE: This system merged with the developing TC-32S, which was later named Gemma by the Mauritius Meteorological Service. For JTWC warning purposes the cyclone was numbered TC-32S following the merger. ************************************************************************* Storm Name: 34S Cyclone Number: 34-S Basin: SIO Date Time Lat Lon Cen Pres MSW Remarks (GMT) (mb) (kts) ------------------------------------------------------------------------- 98 APR 19 0000 10.2 S 74.9 E 40 98 APR 19 0600 10.5 S 74.2 E 40 98 APR 19 1200 10.6 S 73.6 E 40 98 APR 19 1800 10.8 S 72.7 E 40 98 APR 20 0000 11.6 S 71.5 E 40 98 APR 20 1200 11.7 S 68.4 E 35 98 APR 21 0000 12.3 S 66.0 E 35 98 APR 21 1200 12.0 S 65.0 E 35 98 APR 22 0000 11.8 S 62.4 E 35 98 APR 22 1200 12.4 S 59.6 E 30 ************************************************************************* ************************************************************************* AUSTRALIAN REGION (AUS) - From Longitude 90E Eastward to Longitude 160E NOTE: The track presented below is based on operational warnings issued by the Joint Typhoon Warning Center on the island of Guam. The MWS is based on a 1-min averaging period. To convert these to equivalent 10-min average winds, multiply by 0.87. ************************************************************************* Storm Name: 35S Cyclone Number: 35-S Basin: AUS Date Time Lat Lon Cen Pres MSW Remarks (GMT) (mb) (kts) ------------------------------------------------------------------------- 98 APR 19 0000 14.1 S 125.7 E 1002 35 98 APR 19 1200 15.0 S 125.1 E 1004 30 Darwin - 15.0S, 126.0E NOTE: The central pressures given above are taken from bulletins issued by the Darwin TCWC. ************************************************************************* ************************************************************************* SOUTHWEST PACIFIC (SWP) - South Pacific Ocean East of Longitude 160E NOTE: The tracking and intensity information on Southwest Pacific Basin tropical cyclones is taken from real-time operational warnings issued by the Nadi TCWC, Fiji. The MSW are based on a 10-min averaging period. To convert these to equivalent 1-min average winds, multiply by 1.15. However, the wind speed estimates by JTWC or NPMOC, mentioned in the Remarks column, are 1-min average sustained winds. To convert these to equivalent 10-min average winds, multiply by 0.87. ************************************************************************* Storm Name: ZUMAN Cyclone Number: 31-P Basin: SWP Date Time Lat Lon Cen Pres MSW Remarks (GMT) (mb) (kts) ------------------------------------------------------------------------- 98 MAR 29 2100 13.7 S 171.0 E 998 25 98 MAR 30 0000 14.0 S 170.9 E 998 25 98 MAR 30 0600 13.9 S 170.3 E 996 30 98 MAR 30 1200 13.9 S 169.8 E 990 40 98 MAR 30 1800 13.9 S 169.2 E 987 45 98 MAR 31 0000 14.0 S 168.7 E 980 55 98 MAR 31 0600 14.0 S 168.1 E 975 60 98 MAR 31 1200 14.4 S 167.6 E 970 65 98 MAR 31 1800 14.9 S 167.1 E 960 75 98 APR 01 0000 15.3 S 166.5 E 955 80 98 APR 01 0600 15.6 S 166.0 E 955 80 98 APR 01 1200 15.5 S 165.5 E 955 80 JTWC: 75 kts 98 APR 01 1800 15.7 S 165.2 E 955 80 98 APR 02 0000 15.8 S 164.7 E 955 80 JTWC: 15.7S, 164.2E 98 APR 02 0600 15.9 S 164.2 E 955 80 98 APR 02 1200 15.9 S 163.5 E 955 80 98 APR 02 1800 16.0 S 163.0 E 955 80 98 APR 03 0000 15.5 S 162.8 E 955 80 JTWC: 15.4S, 161.9E 98 APR 03 0600 15.6 S 162.3 E 965 70 98 APR 03 1200 15.8 S 161.8 E 965 70 98 APR 03 1800 16.0 S 161.3 E 975 60 98 APR 04 0000 16.6 S 161.4 E 980 55 98 APR 04 0600 16.9 S 161.1 E 985 50 98 APR 04 1200 17.5 S 162.5 E 987 50 98 APR 04 1800 19.0 S 163.6 E 985 50 98 APR 05 0000 19.5 S 164.0 E 985 50 98 APR 05 0600 20.1 S 164.9 E 987 45 98 APR 05 1200 20.6 S 166.2 E 987 45 98 APR 05 1800 22.0 S 168.0 E 990 40 98 APR 06 0000 24.0 S 169.0 E 30 ************************************************************************* Storm Name: ALAN Cyclone Number: 36-P Basin: SWP Date Time Lat Lon Cen Pres MSW Remarks (GMT) (mb) (kts) ------------------------------------------------------------------------- 98 APR 19 0600 14.6 S 158.0 W 1000 25 98 APR 19 1200 14.5 S 158.5 W 999 25 98 APR 19 1800 14.2 S 158.6 W 997 30 98 APR 20 0000 13.8 S 158.3 W 997 30 98 APR 20 0600 14.0 S 158.0 W 997 30 98 APR 20 1200 13.5 S 159.0 W 997 30 98 APR 20 1800 12.7 S 158.9 W 997 35 See Note 98 APR 21 0000 11.7 S 159.4 W 995 35 98 APR 21 0600 11.5 S 158.5 W 995 35 98 APR 21 1200 11.6 S 158.3 W 995 35 98 APR 21 1800 11.0 S 158.0 W 995 35 98 APR 22 0000 11.0 S 158.5 W 995 35 98 APR 22 0600 11.1 S 158.5 W 995 35 98 APR 22 1200 10.5 S 159.0 W 995 35 98 APR 22 1800 10.7 S 159.3 W 995 35 98 APR 23 0000 11.1 S 159.5 W 35 Interpolated position 98 APR 23 0600 11.5 S 159.6 W 35 NPMOC Warning 98 APR 23 1200 12.3 S 158.0 W 998 35 (southern semicircle) 98 APR 23 1800 11.6 S 159.2 W 35 NPMOC Warning 98 APR 24 1200 14.0 S 155.0 W 35 " " 98 APR 24 2100 15.4 S 154.2 W 40 98 APR 25 0000 15.5 S 153.5 W 40 98 APR 25 0600 16.8 S 153.0 W 992 40 98 APR 25 1200 17.6 S 151.6 W 992 40 98 APR 25 1800 15.5 S 152.5 W 998 33 98 APR 26 0000 16.3 S 152.1 W 1000 25 NPMOC: 35 kts 98 APR 26 1800 17.0 S 151.0 W 1004 20 NOTE: The gale force winds indicated from 20/1800Z until 21/1200Z were forecast to be occurring in the southern or southwestern quadrant only. The definition of a tropical cyclone adherred to in WMO Region V requires that gales completely surround the center before the system is classified as a tropical cyclone and assigned a name. This system was accidentally numbered as TC-32P in the first warning issued by NPMOC. In order to avoid confusion this number was retained in subsequent warnings. However, it will officially be known as TC-36P. ************************************************************************* Storm Name: BART Cyclone Number: 37-P Basin: SWP Date Time Lat Lon Cen Pres MSW Remarks (GMT) (mb) (kts) ------------------------------------------------------------------------- 98 APR 28 2200 15.0 S 144.0 W 1006 25 98 APR 29 1200 16.0 S 140.0 W 1000 30 98 APR 29 1800 17.5 S 139.5 W 995 35 98 APR 30 0000 17.8 S 138.0 W 988 45 98 APR 30 0600 18.7 S 138.0 W 988 45 98 APR 30 1200 19.2 S 137.8 W 988 45 98 APR 30 1800 19.4 S 137.2 W 988 45 98 MAY 01 0000 19.7 S 136.0 W 990 40 98 MAY 01 0600 20.0 S 135.2 W 995 35 (southern semi-circle) 98 MAY 01 1200 20.5 S 134.8 W 998 35 ( " " ) 98 MAY 01 1800 21.0 S 134.0 W 1000 30 98 MAY 02 1800 22.0 S 131.0 W 35 (southern quadrant) 98 MAY 03 0000 24.0 S 130.0 W 35 ( " " ) NOTE: The gale force winds indicated after 0000 UTC on 01 May were forecast to be occurring in the southern quadrant or semi-circle only. ************************************************************************* ************************************************************************* *************************************************************************